.ntai-section {
  --ntai-accent: var(--color-gold, var(--wp--preset--color--accent, #2563ff));
  --ntai-accent-strong: var(--color-gold-3, var(--ntai-accent));
  --ntai-on-accent: var(--color-on-accent, #ffffff);
  --ntai-bg: var(--color-dark-2, var(--wp--preset--color--base, #f7f7f5));
  --ntai-surface: var(--color-dark-3, var(--wp--preset--color--base-2, #ffffff));
  --ntai-border: rgba(148, 163, 184, 0.24);
  --ntai-text: var(--color-ink, var(--wp--preset--color--contrast, #172033));
  --ntai-muted: var(--color-ink-muted, var(--wp--preset--color--secondary, #64748b));
  --ntai-radius: var(--radius-lg, 16px);
  --ntai-font-body: var(--font-body, inherit);
  --ntai-font-heading: var(--font-heading, inherit);
  width: 100%;
  margin: 0;
  padding: clamp(56px, 8vw, 104px) 20px;
  background: var(--ntai-bg);
  color: var(--ntai-text);
  font-family: var(--ntai-font-body);
}

.ntai-section,
.ntai-section * {
  box-sizing: border-box;
}

.ntai-section [hidden] {
  display: none !important;
}

.ntai-shell {
  width: min(1120px, 100%);
  margin: 0 auto;
}

.ntai-heading {
  max-width: 700px;
  margin: 0 auto clamp(28px, 5vw, 48px);
  text-align: center;
}

.ntai-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--ntai-accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.ntai-eyebrow::before {
  width: 26px;
  height: 2px;
  background: currentColor;
  content: '';
}

.ntai-title {
  margin: 13px 0 12px;
  color: inherit;
  font-family: var(--ntai-font-heading);
  font-size: clamp(30px, 4.3vw, 54px);
  line-height: 1.12;
  letter-spacing: -0.025em;
}

.ntai-subtitle {
  max-width: 610px;
  margin: 0 auto;
  color: var(--ntai-muted);
  font-size: 16px;
  line-height: 1.75;
}

.ntai-workspace {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  gap: 18px;
  align-items: stretch;
}

.ntai-card {
  min-width: 0;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--ntai-border);
  border-radius: var(--ntai-radius);
  background: var(--ntai-surface);
  box-shadow: 0 18px 48px rgba(2, 6, 23, 0.12);
}

.ntai-card-label {
  margin-bottom: 16px;
  color: var(--ntai-muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.ntai-dropzone {
  display: flex;
  min-height: 240px;
  padding: 28px 20px;
  border: 1px dashed color-mix(in srgb, var(--ntai-accent) 55%, var(--ntai-border));
  border-radius: calc(var(--ntai-radius) - 4px);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 8px;
  color: var(--ntai-text);
  text-align: center;
  cursor: pointer;
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.ntai-dropzone:hover,
.ntai-dropzone:focus-within {
  border-color: var(--ntai-accent);
  background: color-mix(in srgb, var(--ntai-accent) 8%, transparent);
  transform: translateY(-1px);
}

.ntai-dropzone input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.ntai-dropzone strong {
  max-width: 230px;
  font-size: 16px;
  line-height: 1.45;
}

.ntai-dropzone > span:last-child {
  color: var(--ntai-muted);
  font-size: 13px;
}

.ntai-dropzone-icon {
  display: grid;
  width: 42px;
  height: 42px;
  margin-bottom: 5px;
  border-radius: 50%;
  place-items: center;
  background: linear-gradient(135deg, var(--ntai-accent-strong) 0%, var(--ntai-accent) 100%);
  color: var(--ntai-on-accent);
  font-size: 28px;
  font-weight: 300;
  line-height: 1;
}

.ntai-source-preview {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.ntai-source-preview img {
  width: 100%;
  max-height: 220px;
  border-radius: calc(var(--ntai-radius) - 5px);
  object-fit: cover;
}

.ntai-text-button {
  justify-self: start;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ntai-accent);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}

.ntai-primary-button,
.ntai-secondary-button {
  display: inline-flex;
  min-height: 48px;
  width: 100%;
  margin-top: 18px;
  padding: 12px 18px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border-radius: calc(var(--ntai-radius) - 6px);
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 180ms ease, transform 180ms ease, background 180ms ease;
}

.ntai-primary-button {
  background: linear-gradient(135deg, var(--ntai-accent-strong) 0%, var(--ntai-accent) 100%);
  color: var(--ntai-on-accent);
}

.ntai-secondary-button {
  border: 1px solid var(--ntai-border);
  background: transparent;
  color: var(--ntai-text);
}

.ntai-primary-button:hover:not(:disabled),
.ntai-secondary-button:hover:not(:disabled) {
  transform: translateY(-1px);
}

.ntai-primary-button:disabled,
.ntai-secondary-button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.ntai-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid color-mix(in srgb, var(--ntai-on-accent) 42%, transparent);
  border-top-color: var(--ntai-on-accent);
  border-radius: 50%;
  animation: ntai-spin 750ms linear infinite;
}

.ntai-status {
  min-height: 24px;
  margin: 12px 0 0;
  color: var(--ntai-muted);
  font-size: 13px;
  line-height: 1.55;
}

.ntai-status.is-error {
  color: #ef7d7d;
}

.ntai-status.is-success {
  color: #5bc98b;
}

.ntai-result-card {
  display: flex;
  min-height: 100%;
  flex-direction: column;
}

.ntai-result-empty {
  display: flex;
  min-height: 360px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 8px;
  border-radius: calc(var(--ntai-radius) - 5px);
  background: color-mix(in srgb, var(--ntai-text) 5%, transparent);
  color: var(--ntai-muted);
  text-align: center;
}

.ntai-result-empty strong {
  color: var(--ntai-text);
  font-size: 15px;
}

.ntai-result-empty span:last-child {
  font-size: 13px;
}

.ntai-result-empty-mark {
  margin-bottom: 3px;
  color: var(--ntai-accent);
  font-size: 48px;
  line-height: 1;
}

.ntai-result-figure {
  margin: 0;
}

.ntai-result-figure img {
  display: block;
  width: 100%;
  max-height: 620px;
  border-radius: calc(var(--ntai-radius) - 5px);
  background: #0b1020;
  object-fit: contain;
}

.ntai-result-figure figcaption {
  display: flex;
  margin-top: 12px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--ntai-muted);
  font-size: 13px;
}

.ntai-download-link,
.ntai-zalo-link {
  color: var(--ntai-accent);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.ntai-limit-zalo {
  display: inline-block;
  margin-top: 8px;
}

.ntai-followup {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--ntai-border);
}

.ntai-followup textarea {
  display: block;
  width: 100%;
  min-height: 82px;
  padding: 12px 14px;
  resize: vertical;
  border: 1px solid var(--ntai-border);
  border-radius: calc(var(--ntai-radius) - 8px);
  background: transparent;
  color: var(--ntai-text);
  font: inherit;
  font-size: 14px;
  line-height: 1.5;
}

.ntai-followup textarea:focus {
  outline: 2px solid color-mix(in srgb, var(--ntai-accent) 45%, transparent);
  outline-offset: 1px;
}

.ntai-followup-reply {
  margin-top: 14px;
  padding: 14px;
  border-left: 3px solid var(--ntai-accent);
  background: color-mix(in srgb, var(--ntai-accent) 8%, transparent);
}

.ntai-followup-reply p {
  margin: 0 0 12px;
  color: var(--ntai-text);
  font-size: 14px;
  line-height: 1.65;
  white-space: pre-line;
}

.ntai-privacy-note {
  margin: 16px 0 0;
  color: var(--ntai-muted);
  font-size: 12px;
  text-align: center;
}

@keyframes ntai-spin {
  to { transform: rotate(360deg); }
}

@media (max-width: 760px) {
  .ntai-section {
    padding-right: 14px;
    padding-left: 14px;
  }

  .ntai-workspace {
    grid-template-columns: 1fr;
  }

  .ntai-dropzone,
  .ntai-result-empty {
    min-height: 210px;
  }

  .ntai-result-figure figcaption {
    align-items: flex-start;
    flex-direction: column;
  }
}

@supports not (background: color-mix(in srgb, #000 10%, transparent)) {
  .ntai-dropzone:hover,
  .ntai-dropzone:focus-within {
    background: rgba(37, 99, 255, 0.08);
  }

  .ntai-result-empty,
  .ntai-followup-reply {
    background: rgba(148, 163, 184, 0.08);
  }
}